fix constness on _set_ methods
[flac.git] / src / libFLAC / stream_encoder.c
1 /* libFLAC - Free Lossless Audio Codec library
2  * Copyright (C) 2000,2001,2002  Josh Coalson
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA  02111-1307, USA.
18  */
19
20 #include <stdio.h>
21 #include <stdlib.h> /* for malloc() */
22 #include <string.h> /* for memcpy() */
23 #include "FLAC/assert.h"
24 #include "FLAC/seek_table.h"
25 #include "protected/stream_encoder.h"
26 #include "private/bitbuffer.h"
27 #include "private/bitmath.h"
28 #include "private/crc.h"
29 #include "private/cpu.h"
30 #include "private/stream_encoder_framing.h"
31 #include "private/fixed.h"
32 #include "private/lpc.h"
33 #include "private/md5.h"
34 #include "private/memory.h"
35
36 #ifdef min
37 #undef min
38 #endif
39 #define min(x,y) ((x)<(y)?(x):(y))
40
41 #ifdef max
42 #undef max
43 #endif
44 #define max(x,y) ((x)>(y)?(x):(y))
45
46 /***********************************************************************
47  *
48  * Private class method prototypes
49  *
50  ***********************************************************************/
51
52 static FLAC__bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size);
53 static FLAC__bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
54 static FLAC__bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame);
55 static FLAC__bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__int32 integer_signal[], const FLAC__real real_signal[], FLAC__Subframe *subframe[2], FLAC__int32 *residual[2], unsigned *best_subframe, unsigned *best_bits);
56 static FLAC__bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame);
57 static unsigned stream_encoder_evaluate_constant_subframe_(const FLAC__int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe);
58 static unsigned stream_encoder_evaluate_fixed_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
59 static unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const FLAC__real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe);
60 static unsigned stream_encoder_evaluate_verbatim_subframe_(const FLAC__int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe);
61 static unsigned stream_encoder_find_best_partition_order_(struct FLAC__StreamEncoderPrivate *private_, const FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[]);
62 static void stream_encoder_precompute_partition_info_sums_(const FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order);
63 static void stream_encoder_precompute_partition_info_escapes_(const FLAC__int32 residual[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order);
64 #ifdef DONT_ESTIMATE_RICE_BITS
65 static FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits);
66 static FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__int32 residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits);
67 #else
68 static FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits);
69 static FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__uint32 abs_residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits);
70 #endif
71 static unsigned stream_encoder_get_wasted_bits_(FLAC__int32 signal[], unsigned samples);
72
73 /***********************************************************************
74  *
75  * Private class data
76  *
77  ***********************************************************************/
78
79 typedef struct FLAC__StreamEncoderPrivate {
80         unsigned input_capacity;                          /* current size (in samples) of the signal and residual buffers */
81         FLAC__int32 *integer_signal[FLAC__MAX_CHANNELS];  /* the integer version of the input signal */
82         FLAC__int32 *integer_signal_mid_side[2];          /* the integer version of the mid-side input signal (stereo only) */
83         FLAC__real *real_signal[FLAC__MAX_CHANNELS];      /* the floating-point version of the input signal */
84         FLAC__real *real_signal_mid_side[2];              /* the floating-point version of the mid-side input signal (stereo only) */
85         unsigned subframe_bps[FLAC__MAX_CHANNELS];        /* the effective bits per sample of the input signal (stream bps - wasted bits) */
86         unsigned subframe_bps_mid_side[2];                /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */
87         FLAC__int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
88         FLAC__int32 *residual_workspace_mid_side[2][2];
89         FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
90         FLAC__Subframe subframe_workspace_mid_side[2][2];
91         FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
92         FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
93         unsigned best_subframe[FLAC__MAX_CHANNELS];       /* index into the above workspaces */
94         unsigned best_subframe_mid_side[2];
95         unsigned best_subframe_bits[FLAC__MAX_CHANNELS];  /* size in bits of the best subframe for each channel */
96         unsigned best_subframe_bits_mid_side[2];
97         FLAC__uint32 *abs_residual;                       /* workspace where abs(candidate residual) is stored */
98         FLAC__uint64 *abs_residual_partition_sums;        /* workspace where the sum of abs(candidate residual) for each partition is stored */
99         unsigned *raw_bits_per_partition;                 /* workspace where the sum of silog2(candidate residual) for each partition is stored */
100         FLAC__BitBuffer *frame;                           /* the current frame being worked on */
101         double loose_mid_side_stereo_frames_exact;        /* exact number of frames the encoder will use before trying both independent and mid/side frames again */
102         unsigned loose_mid_side_stereo_frames;            /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
103         unsigned loose_mid_side_stereo_frame_count;       /* number of frames using the current channel assignment */
104         FLAC__ChannelAssignment last_channel_assignment;
105         FLAC__StreamMetaData metadata;
106         unsigned current_sample_number;
107         unsigned current_frame_number;
108         struct MD5Context md5context;
109         FLAC__CPUInfo cpuinfo;
110         unsigned (*local_fixed_compute_best_predictor)(const FLAC__int32 data[], unsigned data_len, FLAC__real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]);
111         void (*local_lpc_compute_autocorrelation)(const FLAC__real data[], unsigned data_len, unsigned lag, FLAC__real autoc[]);
112         void (*local_lpc_compute_residual_from_qlp_coefficients)(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
113         void (*local_lpc_compute_residual_from_qlp_coefficients_16bit)(const FLAC__int32 data[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 residual[]);
114         FLAC__bool use_wide_by_block;                     /* use slow 64-bit versions of some functions because of the block size */
115         FLAC__bool use_wide_by_partition;                 /* use slow 64-bit versions of some functions because of the min partition order and blocksize */
116         FLAC__bool use_wide_by_order;                     /* use slow 64-bit versions of some functions because of the lpc order */
117         FLAC__bool precompute_partition_sums;             /* our initial guess as to whether precomputing the partitions sums will be a speed improvement */
118         FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
119         void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
120         void *client_data;
121         /* unaligned (original) pointers to allocated data */
122         FLAC__int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS];
123         FLAC__int32 *integer_signal_mid_side_unaligned[2];
124         FLAC__real *real_signal_unaligned[FLAC__MAX_CHANNELS];
125         FLAC__real *real_signal_mid_side_unaligned[2];
126         FLAC__int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2];
127         FLAC__int32 *residual_workspace_mid_side_unaligned[2][2];
128         FLAC__uint32 *abs_residual_unaligned;
129         FLAC__uint64 *abs_residual_partition_sums_unaligned;
130         unsigned *raw_bits_per_partition_unaligned;
131         /*
132          * These fields have been moved here from private function local
133          * declarations merely to save stack space during encoding.
134          */
135         FLAC__real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; /* from stream_encoder_process_subframe_() */
136         unsigned parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER], raw_bits[2][1 << FLAC__MAX_RICE_PARTITION_ORDER]; /* from stream_encoder_find_best_partition_order_() */
137 } FLAC__StreamEncoderPrivate;
138
139 /***********************************************************************
140  *
141  * Public static class data
142  *
143  ***********************************************************************/
144
145 const char *FLAC__StreamEncoderStateString[] = {
146         "FLAC__STREAM_ENCODER_OK",
147         "FLAC__STREAM_ENCODER_INVALID_CALLBACK",
148         "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS",
149         "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE",
150         "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE",
151         "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE",
152         "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION",
153         "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH",
154         "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
155         "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE",
156         "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
157         "FLAC__STREAM_ENCODER_NOT_STREAMABLE",
158         "FLAC__STREAM_ENCODER_FRAMING_ERROR",
159         "FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE",
160         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING",
161         "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING",
162         "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
163         "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED",
164         "FLAC__STREAM_ENCODER_UNINITIALIZED"
165 };
166
167 const char *FLAC__StreamEncoderWriteStatusString[] = {
168         "FLAC__STREAM_ENCODER_WRITE_OK",
169         "FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR"
170 };
171
172 /***********************************************************************
173  *
174  * Class constructor/destructor
175  *
176  ***********************************************************************/
177 FLAC__StreamEncoder *FLAC__stream_encoder_new()
178 {
179         FLAC__StreamEncoder *encoder;
180
181         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
182
183         encoder = (FLAC__StreamEncoder*)malloc(sizeof(FLAC__StreamEncoder));
184         if(encoder == 0) {
185                 return 0;
186         }
187         encoder->protected_ = (FLAC__StreamEncoderProtected*)malloc(sizeof(FLAC__StreamEncoderProtected));
188         if(encoder->protected_ == 0) {
189                 free(encoder);
190                 return 0;
191         }
192         encoder->private_ = (FLAC__StreamEncoderPrivate*)malloc(sizeof(FLAC__StreamEncoderPrivate));
193         if(encoder->private_ == 0) {
194                 free(encoder->protected_);
195                 free(encoder);
196                 return 0;
197         }
198         encoder->private_->frame = FLAC__bitbuffer_new();
199         if(encoder->private_->frame == 0) {
200                 free(encoder->private_);
201                 free(encoder->protected_);
202                 free(encoder);
203                 return 0;
204         }
205
206         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
207
208         encoder->protected_->streamable_subset = true;
209         encoder->protected_->do_mid_side_stereo = false;
210         encoder->protected_->loose_mid_side_stereo = false;
211         encoder->protected_->channels = 2;
212         encoder->protected_->bits_per_sample = 16;
213         encoder->protected_->sample_rate = 44100;
214         encoder->protected_->blocksize = 1152;
215         encoder->protected_->max_lpc_order = 0;
216         encoder->protected_->qlp_coeff_precision = 0;
217         encoder->protected_->do_qlp_coeff_prec_search = false;
218         encoder->protected_->do_exhaustive_model_search = false;
219         encoder->protected_->do_escape_coding = false;
220         encoder->protected_->min_residual_partition_order = 0;
221         encoder->protected_->max_residual_partition_order = 0;
222         encoder->protected_->rice_parameter_search_dist = 0;
223         encoder->protected_->total_samples_estimate = 0;
224         encoder->protected_->seek_table = 0;
225         encoder->protected_->padding = -1;
226         encoder->protected_->last_metadata_is_last = true;
227
228         encoder->private_->write_callback = 0;
229         encoder->private_->metadata_callback = 0;
230         encoder->private_->client_data = 0;
231
232         return encoder;
233 }
234
235 void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder)
236 {
237         FLAC__ASSERT(encoder != 0);
238         FLAC__ASSERT(encoder->protected_ != 0);
239         FLAC__ASSERT(encoder->private_ != 0);
240         FLAC__ASSERT(encoder->private_->frame != 0);
241
242         FLAC__bitbuffer_delete(encoder->private_->frame);
243         free(encoder->private_);
244         free(encoder->protected_);
245         free(encoder);
246 }
247
248 /***********************************************************************
249  *
250  * Public class methods
251  *
252  ***********************************************************************/
253
254 FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder)
255 {
256         unsigned i;
257         FLAC__StreamMetaData padding_block;
258         FLAC__StreamMetaData seek_table_block;
259
260         FLAC__ASSERT(encoder != 0);
261
262         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
263                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED;
264
265         encoder->protected_->state = FLAC__STREAM_ENCODER_OK;
266
267         if(0 == encoder->private_->write_callback || 0 == encoder->private_->metadata_callback)
268                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_CALLBACK;
269
270         if(encoder->protected_->channels == 0 || encoder->protected_->channels > FLAC__MAX_CHANNELS)
271                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS;
272
273         if(encoder->protected_->do_mid_side_stereo && encoder->protected_->channels != 2)
274                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH;
275
276         if(encoder->protected_->loose_mid_side_stereo && !encoder->protected_->do_mid_side_stereo)
277                 return encoder->protected_->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE;
278
279         if(encoder->protected_->bits_per_sample >= 32)
280                 encoder->protected_->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */
281
282         if(encoder->protected_->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected_->bits_per_sample > FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE)
283                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE;
284
285         if(!FLAC__format_is_valid_sample_rate(encoder->protected_->sample_rate))
286                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE;
287
288         if(encoder->protected_->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected_->blocksize > FLAC__MAX_BLOCK_SIZE)
289                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE;
290
291         if(encoder->protected_->blocksize < encoder->protected_->max_lpc_order)
292                 return encoder->protected_->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
293
294         if(encoder->protected_->qlp_coeff_precision == 0) {
295                 if(encoder->protected_->bits_per_sample < 16) {
296                         /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
297                         /* @@@ until then we'll make a guess */
298                         encoder->protected_->qlp_coeff_precision = max(5, 2 + encoder->protected_->bits_per_sample / 2);
299                 }
300                 else if(encoder->protected_->bits_per_sample == 16) {
301                         if(encoder->protected_->blocksize <= 192)
302                                 encoder->protected_->qlp_coeff_precision = 7;
303                         else if(encoder->protected_->blocksize <= 384)
304                                 encoder->protected_->qlp_coeff_precision = 8;
305                         else if(encoder->protected_->blocksize <= 576)
306                                 encoder->protected_->qlp_coeff_precision = 9;
307                         else if(encoder->protected_->blocksize <= 1152)
308                                 encoder->protected_->qlp_coeff_precision = 10;
309                         else if(encoder->protected_->blocksize <= 2304)
310                                 encoder->protected_->qlp_coeff_precision = 11;
311                         else if(encoder->protected_->blocksize <= 4608)
312                                 encoder->protected_->qlp_coeff_precision = 12;
313                         else
314                                 encoder->protected_->qlp_coeff_precision = 13;
315                 }
316                 else {
317                         encoder->protected_->qlp_coeff_precision = min(13, 8*sizeof(FLAC__int32) - encoder->protected_->bits_per_sample - 1 - 2); /* @@@ -2 to keep things 32-bit safe */
318                 }
319         }
320         else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision + encoder->protected_->bits_per_sample >= 8*sizeof(FLAC__uint32) || encoder->protected_->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
321                 return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;
322
323         if(encoder->protected_->streamable_subset) {
324                 /*@@@ add check for blocksize here */
325                 if(encoder->protected_->bits_per_sample != 8 && encoder->protected_->bits_per_sample != 12 && encoder->protected_->bits_per_sample != 16 && encoder->protected_->bits_per_sample != 20 && encoder->protected_->bits_per_sample != 24)
326                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
327                 if(encoder->protected_->sample_rate > 655350)
328                         return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
329         }
330
331         if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
332                 encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
333         if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
334                 encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;
335
336         encoder->private_->input_capacity = 0;
337         for(i = 0; i < encoder->protected_->channels; i++) {
338                 encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
339                 encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
340         }
341         for(i = 0; i < 2; i++) {
342                 encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
343                 encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
344         }
345         for(i = 0; i < encoder->protected_->channels; i++) {
346                 encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
347                 encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
348                 encoder->private_->best_subframe[i] = 0;
349         }
350         for(i = 0; i < 2; i++) {
351                 encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
352                 encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
353                 encoder->private_->best_subframe_mid_side[i] = 0;
354         }
355         for(i = 0; i < encoder->protected_->channels; i++) {
356                 encoder->private_->subframe_workspace_ptr[i][0] = &encoder->private_->subframe_workspace[i][0];
357                 encoder->private_->subframe_workspace_ptr[i][1] = &encoder->private_->subframe_workspace[i][1];
358         }
359         for(i = 0; i < 2; i++) {
360                 encoder->private_->subframe_workspace_ptr_mid_side[i][0] = &encoder->private_->subframe_workspace_mid_side[i][0];
361                 encoder->private_->subframe_workspace_ptr_mid_side[i][1] = &encoder->private_->subframe_workspace_mid_side[i][1];
362         }
363         encoder->private_->abs_residual_unaligned = encoder->private_->abs_residual = 0;
364         encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
365         encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
366         encoder->private_->loose_mid_side_stereo_frames_exact = (double)encoder->protected_->sample_rate * 0.4 / (double)encoder->protected_->blocksize;
367         encoder->private_->loose_mid_side_stereo_frames = (unsigned)(encoder->private_->loose_mid_side_stereo_frames_exact + 0.5);
368         if(encoder->private_->loose_mid_side_stereo_frames == 0)
369                 encoder->private_->loose_mid_side_stereo_frames = 1;
370         encoder->private_->loose_mid_side_stereo_frame_count = 0;
371         encoder->private_->current_sample_number = 0;
372         encoder->private_->current_frame_number = 0;
373
374         encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
375         encoder->private_->use_wide_by_order = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(max(encoder->protected_->max_lpc_order, FLAC__MAX_FIXED_ORDER))+1 > 30); /*@@@ need to use this? */
376         encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */
377
378         /*
379          * get the CPU info and set the function pointers
380          */
381         FLAC__cpu_info(&encoder->private_->cpuinfo);
382         /* first default to the non-asm routines */
383         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
384         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
385         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
386         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
387         /* now override with asm where appropriate */
388 #ifndef FLAC__NO_ASM
389         if(encoder->private_->cpuinfo.use_asm) {
390 #ifdef FLAC__CPU_IA32
391                 FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
392 #ifdef FLAC__HAS_NASM
393                 if(0 && encoder->private_->cpuinfo.data.ia32.sse) {
394                         if(encoder->protected_->max_lpc_order < 4)
395                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
396                         else if(encoder->protected_->max_lpc_order < 8)
397                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
398                         else if(encoder->protected_->max_lpc_order < 12)
399                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
400                         else
401                                 encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
402                 }
403                 else if(encoder->private_->cpuinfo.data.ia32._3dnow)
404                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
405                 else
406                         encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
407                 if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
408                         encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
409                 if(encoder->private_->cpuinfo.data.ia32.mmx) {
410                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
411                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
412                 }
413                 else {
414                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
415                         encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
416                 }
417 #endif
418 #endif
419         }
420 #endif
421         /* finally override based on wide-ness if necessary */
422         if(encoder->private_->use_wide_by_block) {
423                 encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
424         }
425
426         /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
427         encoder->private_->precompute_partition_sums = (encoder->protected_->max_residual_partition_order > encoder->protected_->min_residual_partition_order) || encoder->protected_->do_escape_coding;
428
429         if(!stream_encoder_resize_buffers_(encoder, encoder->protected_->blocksize)) {
430                 /* the above function sets the state for us in case of an error */
431                 return encoder->protected_->state;
432         }
433
434         if(!FLAC__bitbuffer_init(encoder->private_->frame))
435                 return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
436
437         /*
438          * write the stream header
439          */
440         if(!FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
441                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
442
443         encoder->private_->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
444         encoder->private_->metadata.is_last = (encoder->protected_->seek_table == 0 && encoder->protected_->padding < 0 && encoder->protected_->last_metadata_is_last);
445         encoder->private_->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
446         encoder->private_->metadata.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
447         encoder->private_->metadata.data.stream_info.max_blocksize = encoder->protected_->blocksize;
448         encoder->private_->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
449         encoder->private_->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
450         encoder->private_->metadata.data.stream_info.sample_rate = encoder->protected_->sample_rate;
451         encoder->private_->metadata.data.stream_info.channels = encoder->protected_->channels;
452         encoder->private_->metadata.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
453         encoder->private_->metadata.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
454         memset(encoder->private_->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
455         MD5Init(&encoder->private_->md5context);
456         if(!FLAC__add_metadata_block(&encoder->private_->metadata, encoder->private_->frame))
457                 return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
458
459         if(0 != encoder->protected_->seek_table) {
460                 if(!FLAC__seek_table_is_valid(encoder->protected_->seek_table))
461                         return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE;
462                 seek_table_block.type = FLAC__METADATA_TYPE_SEEKTABLE;
463                 seek_table_block.is_last = (encoder->protected_->padding < 0 && encoder->protected_->last_metadata_is_last);
464                 seek_table_block.length = encoder->protected_->seek_table->num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
465                 seek_table_block.data.seek_table = *encoder->protected_->seek_table;
466                 if(!FLAC__add_metadata_block(&seek_table_block, encoder->private_->frame))
467                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
468         }
469
470         /* add a PADDING block if requested */
471         if(encoder->protected_->padding >= 0) {
472                 padding_block.type = FLAC__METADATA_TYPE_PADDING;
473                 padding_block.is_last = encoder->protected_->last_metadata_is_last;
474                 padding_block.length = (unsigned)encoder->protected_->padding;
475                 if(!FLAC__add_metadata_block(&padding_block, encoder->private_->frame))
476                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
477         }
478
479         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
480         {
481                 FLAC__byte *buffer;
482                 unsigned bytes;
483
484                 FLAC__bitbuffer_get_buffer(encoder->private_->frame, &buffer, &bytes);
485
486                 if(encoder->private_->write_callback(encoder, buffer, bytes, 0, encoder->private_->current_frame_number, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_OK)
487                         return encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
488
489                 FLAC__bitbuffer_release_buffer(encoder->private_->frame);
490         }
491
492         /* now that the metadata block is written, we can init this to an absurdly-high value... */
493         encoder->private_->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
494         /* ... and clear this to 0 */
495         encoder->private_->metadata.data.stream_info.total_samples = 0;
496
497         return encoder->protected_->state;
498 }
499
500 void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder)
501 {
502         unsigned i, channel;
503
504         FLAC__ASSERT(encoder != 0);
505         if(encoder->protected_->state == FLAC__STREAM_ENCODER_UNINITIALIZED)
506                 return;
507         if(encoder->private_->current_sample_number != 0) {
508                 encoder->protected_->blocksize = encoder->private_->current_sample_number;
509                 stream_encoder_process_frame_(encoder, true); /* true => is last frame */
510         }
511         MD5Final(encoder->private_->metadata.data.stream_info.md5sum, &encoder->private_->md5context);
512         encoder->private_->metadata_callback(encoder, &encoder->private_->metadata, encoder->private_->client_data);
513         for(i = 0; i < encoder->protected_->channels; i++) {
514                 if(encoder->private_->integer_signal_unaligned[i] != 0) {
515                         free(encoder->private_->integer_signal_unaligned[i]);
516                         encoder->private_->integer_signal_unaligned[i] = 0;
517                 }
518                 if(encoder->private_->real_signal_unaligned[i] != 0) {
519                         free(encoder->private_->real_signal_unaligned[i]);
520                         encoder->private_->real_signal_unaligned[i] = 0;
521                 }
522         }
523         for(i = 0; i < 2; i++) {
524                 if(encoder->private_->integer_signal_mid_side_unaligned[i] != 0) {
525                         free(encoder->private_->integer_signal_mid_side_unaligned[i]);
526                         encoder->private_->integer_signal_mid_side_unaligned[i] = 0;
527                 }
528                 if(encoder->private_->real_signal_mid_side_unaligned[i] != 0) {
529                         free(encoder->private_->real_signal_mid_side_unaligned[i]);
530                         encoder->private_->real_signal_mid_side_unaligned[i] = 0;
531                 }
532         }
533         for(channel = 0; channel < encoder->protected_->channels; channel++) {
534                 for(i = 0; i < 2; i++) {
535                         if(encoder->private_->residual_workspace_unaligned[channel][i] != 0) {
536                                 free(encoder->private_->residual_workspace_unaligned[channel][i]);
537                                 encoder->private_->residual_workspace_unaligned[channel][i] = 0;
538                         }
539                 }
540         }
541         for(channel = 0; channel < 2; channel++) {
542                 for(i = 0; i < 2; i++) {
543                         if(encoder->private_->residual_workspace_mid_side_unaligned[channel][i] != 0) {
544                                 free(encoder->private_->residual_workspace_mid_side_unaligned[channel][i]);
545                                 encoder->private_->residual_workspace_mid_side_unaligned[channel][i] = 0;
546                         }
547                 }
548         }
549         if(encoder->private_->abs_residual_unaligned != 0) {
550                 free(encoder->private_->abs_residual_unaligned);
551                 encoder->private_->abs_residual_unaligned = 0;
552         }
553         if(encoder->private_->abs_residual_partition_sums_unaligned != 0) {
554                 free(encoder->private_->abs_residual_partition_sums_unaligned);
555                 encoder->private_->abs_residual_partition_sums_unaligned = 0;
556         }
557         if(encoder->private_->raw_bits_per_partition_unaligned != 0) {
558                 free(encoder->private_->raw_bits_per_partition_unaligned);
559                 encoder->private_->raw_bits_per_partition_unaligned = 0;
560         }
561         FLAC__bitbuffer_free(encoder->private_->frame);
562
563         encoder->protected_->state = FLAC__STREAM_ENCODER_UNINITIALIZED;
564 }
565
566 FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value)
567 {
568         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
569                 return false;
570         encoder->protected_->streamable_subset = value;
571         return true;
572 }
573
574 FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
575 {
576         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
577                 return false;
578         encoder->protected_->do_mid_side_stereo = value;
579         return true;
580 }
581
582 FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value)
583 {
584         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
585                 return false;
586         encoder->protected_->loose_mid_side_stereo = value;
587         return true;
588 }
589
590 FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value)
591 {
592         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
593                 return false;
594         encoder->protected_->channels = value;
595         return true;
596 }
597
598 FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value)
599 {
600         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
601                 return false;
602         encoder->protected_->bits_per_sample = value;
603         return true;
604 }
605
606 FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value)
607 {
608         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
609                 return false;
610         encoder->protected_->sample_rate = value;
611         return true;
612 }
613
614 FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value)
615 {
616         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
617                 return false;
618         encoder->protected_->blocksize = value;
619         return true;
620 }
621
622 FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value)
623 {
624         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
625                 return false;
626         encoder->protected_->max_lpc_order = value;
627         return true;
628 }
629
630 FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value)
631 {
632         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
633                 return false;
634         encoder->protected_->qlp_coeff_precision = value;
635         return true;
636 }
637
638 FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
639 {
640         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
641                 return false;
642         encoder->protected_->do_qlp_coeff_prec_search = value;
643         return true;
644 }
645
646 FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value)
647 {
648         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
649                 return false;
650         encoder->protected_->do_escape_coding = value;
651         return true;
652 }
653
654 FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value)
655 {
656         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
657                 return false;
658         encoder->protected_->do_exhaustive_model_search = value;
659         return true;
660 }
661
662 FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
663 {
664         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
665                 return false;
666         encoder->protected_->min_residual_partition_order = value;
667         return true;
668 }
669
670 FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value)
671 {
672         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
673                 return false;
674         encoder->protected_->max_residual_partition_order = value;
675         return true;
676 }
677
678 FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value)
679 {
680         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
681                 return false;
682         encoder->protected_->rice_parameter_search_dist = value;
683         return true;
684 }
685
686 FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value)
687 {
688         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
689                 return false;
690         encoder->protected_->total_samples_estimate = value;
691         return true;
692 }
693
694 FLAC__bool FLAC__stream_encoder_set_seek_table(FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData_SeekTable *value)
695 {
696         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
697                 return false;
698         encoder->protected_->seek_table = value;
699         return true;
700 }
701
702 FLAC__bool FLAC__stream_encoder_set_padding(FLAC__StreamEncoder *encoder, int value)
703 {
704         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
705                 return false;
706         encoder->protected_->padding = value;
707         return true;
708 }
709
710 FLAC__bool FLAC__stream_encoder_set_last_metadata_is_last(FLAC__StreamEncoder *encoder, FLAC__bool value)
711 {
712         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
713                 return false;
714         encoder->protected_->last_metadata_is_last = value;
715         return true;
716 }
717
718 FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteStatus (*value)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data))
719 {
720         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
721                 return false;
722         encoder->private_->write_callback = value;
723         return true;
724 }
725
726 FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, void (*value)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data))
727 {
728         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
729                 return false;
730         encoder->private_->metadata_callback = value;
731         return true;
732 }
733
734 FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value)
735 {
736         if(encoder->protected_->state != FLAC__STREAM_ENCODER_UNINITIALIZED)
737                 return false;
738         encoder->private_->client_data = value;
739         return true;
740 }
741
742 FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder)
743 {
744         return encoder->protected_->state;
745 }
746
747 FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder)
748 {
749         return encoder->protected_->streamable_subset;
750 }
751
752 FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder)
753 {
754         return encoder->protected_->do_mid_side_stereo;
755 }
756
757 FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder)
758 {
759         return encoder->protected_->loose_mid_side_stereo;
760 }
761
762 unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder)
763 {
764         return encoder->protected_->channels;
765 }
766
767 unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder)
768 {
769         return encoder->protected_->bits_per_sample;
770 }
771
772 unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder)
773 {
774         return encoder->protected_->sample_rate;
775 }
776
777 unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder)
778 {
779         return encoder->protected_->blocksize;
780 }
781
782 unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder)
783 {
784         return encoder->protected_->max_lpc_order;
785 }
786
787 unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder)
788 {
789         return encoder->protected_->qlp_coeff_precision;
790 }
791
792 FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder)
793 {
794         return encoder->protected_->do_qlp_coeff_prec_search;
795 }
796
797 FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder)
798 {
799         return encoder->protected_->do_escape_coding;
800 }
801
802 FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder)
803 {
804         return encoder->protected_->do_exhaustive_model_search;
805 }
806
807 unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder)
808 {
809         return encoder->protected_->min_residual_partition_order;
810 }
811
812 unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder)
813 {
814         return encoder->protected_->max_residual_partition_order;
815 }
816
817 unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder)
818 {
819         return encoder->protected_->rice_parameter_search_dist;
820 }
821
822 FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 *buf[], unsigned samples)
823 {
824         unsigned i, j, channel;
825         FLAC__int32 x, mid, side;
826         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
827
828         FLAC__ASSERT(encoder != 0);
829         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
830
831         j = 0;
832         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
833                 do {
834                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
835                                 x = mid = side = buf[0][j];
836                                 encoder->private_->integer_signal[0][i] = x;
837                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
838                                 x = buf[1][j];
839                                 encoder->private_->integer_signal[1][i] = x;
840                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
841                                 mid += x;
842                                 side -= x;
843                                 mid >>= 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */
844                                 encoder->private_->integer_signal_mid_side[1][i] = side;
845                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
846                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
847                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
848                                 encoder->private_->current_sample_number++;
849                         }
850                         if(i == blocksize) {
851                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
852                                         return false;
853                         }
854                 } while(j < samples);
855         }
856         else {
857                 do {
858                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
859                                 for(channel = 0; channel < channels; channel++) {
860                                         x = buf[channel][j];
861                                         encoder->private_->integer_signal[channel][i] = x;
862                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
863                                 }
864                                 encoder->private_->current_sample_number++;
865                         }
866                         if(i == blocksize) {
867                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
868                                         return false;
869                         }
870                 } while(j < samples);
871         }
872
873         return true;
874 }
875
876 /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */
877 FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buf[], unsigned samples)
878 {
879         unsigned i, j, k, channel;
880         FLAC__int32 x, mid, side;
881         const unsigned channels = encoder->protected_->channels, blocksize = encoder->protected_->blocksize;
882
883         FLAC__ASSERT(encoder != 0);
884         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
885
886         j = k = 0;
887         if(encoder->protected_->do_mid_side_stereo && channels == 2) {
888                 do {
889                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
890                                 x = mid = side = buf[k++];
891                                 encoder->private_->integer_signal[0][i] = x;
892                                 encoder->private_->real_signal[0][i] = (FLAC__real)x;
893                                 x = buf[k++];
894                                 encoder->private_->integer_signal[1][i] = x;
895                                 encoder->private_->real_signal[1][i] = (FLAC__real)x;
896                                 mid += x;
897                                 side -= x;
898                                 mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
899                                 encoder->private_->integer_signal_mid_side[1][i] = side;
900                                 encoder->private_->integer_signal_mid_side[0][i] = mid;
901                                 encoder->private_->real_signal_mid_side[1][i] = (FLAC__real)side;
902                                 encoder->private_->real_signal_mid_side[0][i] = (FLAC__real)mid;
903                                 encoder->private_->current_sample_number++;
904                         }
905                         if(i == blocksize) {
906                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
907                                         return false;
908                         }
909                 } while(j < samples);
910         }
911         else {
912                 do {
913                         for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
914                                 for(channel = 0; channel < channels; channel++) {
915                                         x = buf[k++];
916                                         encoder->private_->integer_signal[channel][i] = x;
917                                         encoder->private_->real_signal[channel][i] = (FLAC__real)x;
918                                 }
919                                 encoder->private_->current_sample_number++;
920                         }
921                         if(i == blocksize) {
922                                 if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */
923                                         return false;
924                         }
925                 } while(j < samples);
926         }
927
928         return true;
929 }
930
931 FLAC__bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
932 {
933         FLAC__bool ok;
934         unsigned i, channel;
935
936         FLAC__ASSERT(new_size > 0);
937         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
938         FLAC__ASSERT(encoder->private_->current_sample_number == 0);
939
940         /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
941         if(new_size <= encoder->private_->input_capacity)
942                 return true;
943
944         ok = true;
945
946         /* WATCHOUT: FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx() requires that the input arrays (in our case the integer signals) have a buffer of up to 3 zeroes in front (at negative indices) for alignment purposes; we use 4 to keep the data well-aligned. */
947
948         for(i = 0; ok && i < encoder->protected_->channels; i++) {
949                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
950                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
951                 memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
952                 encoder->private_->integer_signal[i] += 4;
953         }
954         for(i = 0; ok && i < 2; i++) {
955                 ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_mid_side_unaligned[i], &encoder->private_->integer_signal_mid_side[i]);
956                 ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_mid_side_unaligned[i], &encoder->private_->real_signal_mid_side[i]);
957                 memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);
958                 encoder->private_->integer_signal_mid_side[i] += 4;
959         }
960         for(channel = 0; ok && channel < encoder->protected_->channels; channel++) {
961                 for(i = 0; ok && i < 2; i++) {
962                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_unaligned[channel][i], &encoder->private_->residual_workspace[channel][i]);
963                 }
964         }
965         for(channel = 0; ok && channel < 2; channel++) {
966                 for(i = 0; ok && i < 2; i++) {
967                         ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private_->residual_workspace_mid_side_unaligned[channel][i], &encoder->private_->residual_workspace_mid_side[channel][i]);
968                 }
969         }
970         ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private_->abs_residual_unaligned, &encoder->private_->abs_residual);
971         if(encoder->private_->precompute_partition_sums || encoder->protected_->do_escape_coding) /* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
972                 ok = ok && FLAC__memory_alloc_aligned_uint64_array(new_size * 2, &encoder->private_->abs_residual_partition_sums_unaligned, &encoder->private_->abs_residual_partition_sums);
973         if(encoder->protected_->do_escape_coding)
974                 ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private_->raw_bits_per_partition_unaligned, &encoder->private_->raw_bits_per_partition);
975
976         if(ok)
977                 encoder->private_->input_capacity = new_size;
978         else
979                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
980
981         return ok;
982 }
983
984 /***********************************************************************
985  *
986  * Private class methods
987  *
988  ***********************************************************************/
989
990 FLAC__bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
991 {
992         const FLAC__byte *buffer;
993         unsigned bytes;
994
995         FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
996
997         /*
998          * Accumulate raw signal to the MD5 signature
999          */
1000         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
1001         if(!FLAC__MD5Accumulate(&encoder->private_->md5context, encoder->private_->integer_signal, encoder->protected_->channels, encoder->protected_->blocksize, (encoder->protected_->bits_per_sample+7) / 8)) {
1002                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1003                 return false;
1004         }
1005
1006         /*
1007          * Process the frame header and subframes into the frame bitbuffer
1008          */
1009         if(!stream_encoder_process_subframes_(encoder, is_last_frame)) {
1010                 /* the above function sets the state for us in case of an error */
1011                 return false;
1012         }
1013
1014         /*
1015          * Zero-pad the frame to a byte_boundary
1016          */
1017         if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(encoder->private_->frame)) {
1018                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1019                 return false;
1020         }
1021
1022         /*
1023          * CRC-16 the whole thing
1024          */
1025         FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(encoder->private_->frame));
1026         FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__bitbuffer_get_write_crc16(encoder->private_->frame), FLAC__FRAME_FOOTER_CRC_LEN);
1027
1028         /*
1029          * Write it
1030          */
1031         FLAC__bitbuffer_get_buffer(encoder->private_->frame, &buffer, &bytes);
1032         if(encoder->private_->write_callback(encoder, buffer, bytes, encoder->protected_->blocksize, encoder->private_->current_frame_number, encoder->private_->client_data) != FLAC__STREAM_ENCODER_WRITE_OK) {
1033                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING;
1034                 return false;
1035         }
1036         FLAC__bitbuffer_release_buffer(encoder->private_->frame);
1037
1038         /*
1039          * Get ready for the next frame
1040          */
1041         encoder->private_->current_sample_number = 0;
1042         encoder->private_->current_frame_number++;
1043         encoder->private_->metadata.data.stream_info.total_samples += (FLAC__uint64)encoder->protected_->blocksize;
1044         encoder->private_->metadata.data.stream_info.min_framesize = min(bytes, encoder->private_->metadata.data.stream_info.min_framesize);
1045         encoder->private_->metadata.data.stream_info.max_framesize = max(bytes, encoder->private_->metadata.data.stream_info.max_framesize);
1046
1047         return true;
1048 }
1049
1050 FLAC__bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_last_frame)
1051 {
1052         FLAC__FrameHeader frame_header;
1053         unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
1054         FLAC__bool do_independent, do_mid_side, precompute_partition_sums;
1055
1056         /*
1057          * Calculate the min,max Rice partition orders
1058          */
1059         if(is_last_frame) {
1060                 max_partition_order = 0;
1061         }
1062         else {
1063                 unsigned limit = 0, b = encoder->protected_->blocksize;
1064                 while(!(b & 1)) {
1065                         limit++;
1066                         b >>= 1;
1067                 }
1068                 max_partition_order = min(encoder->protected_->max_residual_partition_order, limit);
1069         }
1070         min_partition_order = min(min_partition_order, max_partition_order);
1071
1072         precompute_partition_sums = encoder->private_->precompute_partition_sums && ((max_partition_order > min_partition_order) || encoder->protected_->do_escape_coding);
1073
1074         /*
1075          * Setup the frame
1076          */
1077         if(!FLAC__bitbuffer_clear(encoder->private_->frame)) {
1078                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
1079                 return false;
1080         }
1081         frame_header.blocksize = encoder->protected_->blocksize;
1082         frame_header.sample_rate = encoder->protected_->sample_rate;
1083         frame_header.channels = encoder->protected_->channels;
1084         frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
1085         frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
1086         frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
1087         frame_header.number.frame_number = encoder->private_->current_frame_number;
1088
1089         /*
1090          * Figure out what channel assignments to try
1091          */
1092         if(encoder->protected_->do_mid_side_stereo) {
1093                 if(encoder->protected_->loose_mid_side_stereo) {
1094                         if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
1095                                 do_independent = true;
1096                                 do_mid_side = true;
1097                         }
1098                         else {
1099                                 do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
1100                                 do_mid_side = !do_independent;
1101                         }
1102                 }
1103                 else {
1104                         do_independent = true;
1105                         do_mid_side = true;
1106                 }
1107         }
1108         else {
1109                 do_independent = true;
1110                 do_mid_side = false;
1111         }
1112
1113         FLAC__ASSERT(do_independent || do_mid_side);
1114
1115         /*
1116          * Check for wasted bits; set effective bps for each subframe
1117          */
1118         if(do_independent) {
1119                 unsigned w;
1120                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1121                         w = stream_encoder_get_wasted_bits_(encoder->private_->integer_signal[channel], encoder->protected_->blocksize);
1122                         encoder->private_->subframe_workspace[channel][0].wasted_bits = encoder->private_->subframe_workspace[channel][1].wasted_bits = w;
1123                         encoder->private_->subframe_bps[channel] = encoder->protected_->bits_per_sample - w;
1124                 }
1125         }
1126         if(do_mid_side) {
1127                 unsigned w;
1128                 FLAC__ASSERT(encoder->protected_->channels == 2);
1129                 for(channel = 0; channel < 2; channel++) {
1130                         w = stream_encoder_get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel], encoder->protected_->blocksize);
1131                         encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
1132                         encoder->private_->subframe_bps_mid_side[channel] = encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
1133                 }
1134         }
1135
1136         /*
1137          * First do a normal encoding pass of each independent channel
1138          */
1139         if(do_independent) {
1140                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1141                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, precompute_partition_sums, false, &frame_header, encoder->private_->subframe_bps[channel], encoder->private_->integer_signal[channel], encoder->private_->real_signal[channel], encoder->private_->subframe_workspace_ptr[channel], encoder->private_->residual_workspace[channel], encoder->private_->best_subframe+channel, encoder->private_->best_subframe_bits+channel))
1142                                 return false;
1143                 }
1144         }
1145
1146         /*
1147          * Now do mid and side channels if requested
1148          */
1149         if(do_mid_side) {
1150                 FLAC__ASSERT(encoder->protected_->channels == 2);
1151
1152                 for(channel = 0; channel < 2; channel++) {
1153                         if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, precompute_partition_sums, false, &frame_header, encoder->private_->subframe_bps_mid_side[channel], encoder->private_->integer_signal_mid_side[channel], encoder->private_->real_signal_mid_side[channel], encoder->private_->subframe_workspace_ptr_mid_side[channel], encoder->private_->residual_workspace_mid_side[channel], encoder->private_->best_subframe_mid_side+channel, encoder->private_->best_subframe_bits_mid_side+channel))
1154                                 return false;
1155                 }
1156         }
1157
1158         /*
1159          * Compose the frame bitbuffer
1160          */
1161         if(do_mid_side) {
1162                 unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */
1163                 FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */
1164                 FLAC__ChannelAssignment channel_assignment;
1165
1166                 FLAC__ASSERT(encoder->protected_->channels == 2);
1167
1168                 if(encoder->protected_->loose_mid_side_stereo && encoder->private_->loose_mid_side_stereo_frame_count > 0) {
1169                         channel_assignment = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
1170                 }
1171                 else {
1172                         unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
1173                         unsigned min_bits;
1174                         FLAC__ChannelAssignment ca;
1175
1176                         FLAC__ASSERT(do_independent && do_mid_side);
1177
1178                         /* We have to figure out which channel assignent results in the smallest frame */
1179                         bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits         [1];
1180                         bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE  ] = encoder->private_->best_subframe_bits         [0] + encoder->private_->best_subframe_bits_mid_side[1];
1181                         bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private_->best_subframe_bits         [1] + encoder->private_->best_subframe_bits_mid_side[1];
1182                         bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE   ] = encoder->private_->best_subframe_bits_mid_side[0] + encoder->private_->best_subframe_bits_mid_side[1];
1183
1184                         for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
1185                                 if(bits[ca] < min_bits) {
1186                                         min_bits = bits[ca];
1187                                         channel_assignment = ca;
1188                                 }
1189                         }
1190                 }
1191
1192                 frame_header.channel_assignment = channel_assignment;
1193
1194                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1195                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1196                         return false;
1197                 }
1198
1199                 switch(channel_assignment) {
1200                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1201                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1202                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1203                                 break;
1204                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1205                                 left_subframe  = &encoder->private_->subframe_workspace         [0][encoder->private_->best_subframe         [0]];
1206                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1207                                 break;
1208                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1209                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1210                                 right_subframe = &encoder->private_->subframe_workspace         [1][encoder->private_->best_subframe         [1]];
1211                                 break;
1212                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1213                                 left_subframe  = &encoder->private_->subframe_workspace_mid_side[0][encoder->private_->best_subframe_mid_side[0]];
1214                                 right_subframe = &encoder->private_->subframe_workspace_mid_side[1][encoder->private_->best_subframe_mid_side[1]];
1215                                 break;
1216                         default:
1217                                 FLAC__ASSERT(0);
1218                 }
1219
1220                 switch(channel_assignment) {
1221                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1222                                 left_bps  = encoder->private_->subframe_bps         [0];
1223                                 right_bps = encoder->private_->subframe_bps         [1];
1224                                 break;
1225                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1226                                 left_bps  = encoder->private_->subframe_bps         [0];
1227                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1228                                 break;
1229                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1230                                 left_bps  = encoder->private_->subframe_bps_mid_side[1];
1231                                 right_bps = encoder->private_->subframe_bps         [1];
1232                                 break;
1233                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1234                                 left_bps  = encoder->private_->subframe_bps_mid_side[0];
1235                                 right_bps = encoder->private_->subframe_bps_mid_side[1];
1236                                 break;
1237                         default:
1238                                 FLAC__ASSERT(0);
1239                 }
1240
1241                 /* note that encoder_add_subframe_ sets the state for us in case of an error */
1242                 if(!stream_encoder_add_subframe_(encoder, &frame_header, left_bps , left_subframe , encoder->private_->frame))
1243                         return false;
1244                 if(!stream_encoder_add_subframe_(encoder, &frame_header, right_bps, right_subframe, encoder->private_->frame))
1245                         return false;
1246         }
1247         else {
1248                 if(!FLAC__frame_add_header(&frame_header, encoder->protected_->streamable_subset, is_last_frame, encoder->private_->frame)) {
1249                         encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
1250                         return false;
1251                 }
1252
1253                 for(channel = 0; channel < encoder->protected_->channels; channel++) {
1254                         if(!stream_encoder_add_subframe_(encoder, &frame_header, encoder->private_->subframe_bps[channel], &encoder->private_->subframe_workspace[channel][encoder->private_->best_subframe[channel]], encoder->private_->frame)) {
1255                                 /* the above function sets the state for us in case of an error */
1256                                 return false;
1257                         }
1258                 }
1259         }
1260
1261         if(encoder->protected_->loose_mid_side_stereo) {
1262                 encoder->private_->loose_mid_side_stereo_frame_count++;
1263                 if(encoder->private_->loose_mid_side_stereo_frame_count >= encoder->private_->loose_mid_side_stereo_frames)
1264                         encoder->private_->loose_mid_side_stereo_frame_count = 0;
1265         }
1266
1267         encoder->private_->last_channel_assignment = frame_header.channel_assignment;
1268
1269         return true;
1270 }
1271
1272 FLAC__bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__int32 integer_signal[], const FLAC__real real_signal[], FLAC__Subframe *subframe[2], FLAC__int32 *residual[2], unsigned *best_subframe, unsigned *best_bits)
1273 {
1274         FLAC__real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
1275         FLAC__real lpc_residual_bits_per_sample;
1276         FLAC__real autoc[FLAC__MAX_LPC_ORDER+1]; /* WATCHOUT: the size is important even though encoder->protected_->max_lpc_order might be less; some asm routines need all the space */
1277         FLAC__real lpc_error[FLAC__MAX_LPC_ORDER];
1278         unsigned min_lpc_order, max_lpc_order, lpc_order;
1279         unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
1280         unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
1281         unsigned rice_parameter;
1282         unsigned _candidate_bits, _best_bits;
1283         unsigned _best_subframe;
1284
1285         /* verbatim subframe is the baseline against which we measure other compressed subframes */
1286         _best_subframe = 0;
1287         _best_bits = stream_encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]);
1288
1289         if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
1290                 /* check for constant subframe */
1291                 guess_fixed_order = encoder->private_->local_fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
1292                 if(fixed_residual_bits_per_sample[1] == 0.0) {
1293                         /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
1294                         unsigned i, signal_is_constant = true;
1295                         for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
1296                                 if(integer_signal[0] != integer_signal[i]) {
1297                                         signal_is_constant = false;
1298                                         break;
1299                                 }
1300                         }
1301                         if(signal_is_constant) {
1302                                 _candidate_bits = stream_encoder_evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]);
1303                                 if(_candidate_bits < _best_bits) {
1304                                         _best_subframe = !_best_subframe;
1305                                         _best_bits = _candidate_bits;
1306                                 }
1307                         }
1308                 }
1309                 else {
1310                         /* encode fixed */
1311                         if(encoder->protected_->do_exhaustive_model_search) {
1312                                 min_fixed_order = 0;
1313                                 max_fixed_order = FLAC__MAX_FIXED_ORDER;
1314                         }
1315                         else {
1316                                 min_fixed_order = max_fixed_order = guess_fixed_order;
1317                         }
1318                         for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
1319                                 if(fixed_residual_bits_per_sample[fixed_order] >= (FLAC__real)subframe_bps)
1320                                         continue; /* don't even try */
1321                                 rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */
1322 #ifndef FLAC__SYMMETRIC_RICE
1323                                 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1324 #endif
1325                                 if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1326 #ifdef DEBUG_VERBOSE
1327                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @0\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1328 #endif
1329                                         rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1330                                 }
1331                                 _candidate_bits = stream_encoder_evaluate_fixed_subframe_(encoder, integer_signal, residual[!_best_subframe], encoder->private_->abs_residual, encoder->private_->abs_residual_partition_sums, encoder->private_->raw_bits_per_partition, frame_header->blocksize, subframe_bps, fixed_order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, encoder->protected_->do_escape_coding, encoder->protected_->rice_parameter_search_dist, subframe[!_best_subframe]);
1332                                 if(_candidate_bits < _best_bits) {
1333                                         _best_subframe = !_best_subframe;
1334                                         _best_bits = _candidate_bits;
1335                                 }
1336                         }
1337
1338                         /* encode lpc */
1339                         if(encoder->protected_->max_lpc_order > 0) {
1340                                 if(encoder->protected_->max_lpc_order >= frame_header->blocksize)
1341                                         max_lpc_order = frame_header->blocksize-1;
1342                                 else
1343                                         max_lpc_order = encoder->protected_->max_lpc_order;
1344                                 if(max_lpc_order > 0) {
1345                                         encoder->private_->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
1346                                         /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */
1347                                         if(autoc[0] != 0.0) {
1348                                                 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, encoder->private_->lp_coeff, lpc_error);
1349                                                 if(encoder->protected_->do_exhaustive_model_search) {
1350                                                         min_lpc_order = 1;
1351                                                 }
1352                                                 else {
1353                                                         unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps);
1354                                                         min_lpc_order = max_lpc_order = guess_lpc_order;
1355                                                 }
1356                                                 if(encoder->protected_->do_qlp_coeff_prec_search) {
1357                                                         min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
1358                                                         max_qlp_coeff_precision = min(8*sizeof(FLAC__int32) - subframe_bps - 1 - 2, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1); /* -2 to keep things 32-bit safe */
1359                                                 }
1360                                                 else {
1361                                                         min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected_->qlp_coeff_precision;
1362                                                 }
1363                                                 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
1364                                                         lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
1365                                                         if(lpc_residual_bits_per_sample >= (FLAC__real)subframe_bps)
1366                                                                 continue; /* don't even try */
1367                                                         rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
1368 #ifndef FLAC__SYMMETRIC_RICE
1369                                                         rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
1370 #endif
1371                                                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1372 #ifdef DEBUG_VERBOSE
1373                                                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @1\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1374 #endif
1375                                                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1376                                                         }
1377                                                         for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
1378                                                                 _candidate_bits = stream_encoder_evaluate_lpc_subframe_(encoder, integer_signal, residual[!_best_subframe], encoder->private_->abs_residual, encoder->private_->abs_residual_partition_sums, encoder->private_->raw_bits_per_partition, encoder->private_->lp_coeff[lpc_order-1], frame_header->blocksize, subframe_bps, lpc_order, qlp_coeff_precision, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, encoder->protected_->do_escape_coding, encoder->protected_->rice_parameter_search_dist, subframe[!_best_subframe]);
1379                                                                 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
1380                                                                         if(_candidate_bits < _best_bits) {
1381                                                                                 _best_subframe = !_best_subframe;
1382                                                                                 _best_bits = _candidate_bits;
1383                                                                         }
1384                                                                 }
1385                                                         }
1386                                                 }
1387                                         }
1388                                 }
1389                         }
1390                 }
1391         }
1392
1393         *best_subframe = _best_subframe;
1394         *best_bits = _best_bits;
1395
1396         return true;
1397 }
1398
1399 FLAC__bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
1400 {
1401         switch(subframe->type) {
1402                 case FLAC__SUBFRAME_TYPE_CONSTANT:
1403                         if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) {
1404                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1405                                 return false;
1406                         }
1407                         break;
1408                 case FLAC__SUBFRAME_TYPE_FIXED:
1409                         if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) {
1410                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1411                                 return false;
1412                         }
1413                         break;
1414                 case FLAC__SUBFRAME_TYPE_LPC:
1415                         if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) {
1416                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1417                                 return false;
1418                         }
1419                         break;
1420                 case FLAC__SUBFRAME_TYPE_VERBATIM:
1421                         if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) {
1422                                 encoder->protected_->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING;
1423                                 return false;
1424                         }
1425                         break;
1426                 default:
1427                         FLAC__ASSERT(0);
1428         }
1429
1430         return true;
1431 }
1432
1433 unsigned stream_encoder_evaluate_constant_subframe_(const FLAC__int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe)
1434 {
1435         subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
1436         subframe->data.constant.value = signal;
1437
1438         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps;
1439 }
1440
1441 unsigned stream_encoder_evaluate_fixed_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1442 {
1443         unsigned i, residual_bits;
1444         const unsigned residual_samples = blocksize - order;
1445
1446         FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
1447
1448         subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
1449
1450         subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1451         subframe->data.fixed.residual = residual;
1452
1453         residual_bits = stream_encoder_find_best_partition_order_(encoder->private_, residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, do_escape_coding, rice_parameter_search_dist, &subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.raw_bits);
1454
1455         subframe->data.fixed.order = order;
1456         for(i = 0; i < order; i++)
1457                 subframe->data.fixed.warmup[i] = signal[i];
1458
1459         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits;
1460 }
1461
1462 unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const FLAC__int32 signal[], FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const FLAC__real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe)
1463 {
1464         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
1465         unsigned i, residual_bits;
1466         int quantization, ret;
1467         const unsigned residual_samples = blocksize - order;
1468
1469         ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, subframe_bps, qlp_coeff, &quantization);
1470         if(ret != 0)
1471                 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
1472
1473         if(subframe_bps <= 16 && qlp_coeff_precision <= 16)
1474                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1475         else
1476                 encoder->private_->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
1477
1478         subframe->type = FLAC__SUBFRAME_TYPE_LPC;
1479
1480         subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
1481         subframe->data.lpc.residual = residual;
1482
1483         residual_bits = stream_encoder_find_best_partition_order_(encoder->private_, residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, precompute_partition_sums, do_escape_coding, rice_parameter_search_dist, &subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.raw_bits);
1484
1485         subframe->data.lpc.order = order;
1486         subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
1487         subframe->data.lpc.quantization_level = quantization;
1488         memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(FLAC__int32)*FLAC__MAX_LPC_ORDER);
1489         for(i = 0; i < order; i++)
1490                 subframe->data.lpc.warmup[i] = signal[i];
1491
1492         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + subframe_bps)) + residual_bits;
1493 }
1494
1495 unsigned stream_encoder_evaluate_verbatim_subframe_(const FLAC__int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe)
1496 {
1497         subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
1498
1499         subframe->data.verbatim.data = signal;
1500
1501         return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps);
1502 }
1503
1504 unsigned stream_encoder_find_best_partition_order_(FLAC__StreamEncoderPrivate *private_, const FLAC__int32 residual[], FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, FLAC__bool precompute_partition_sums, FLAC__bool do_escape_coding, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[])
1505 {
1506         FLAC__int32 r;
1507         unsigned residual_bits, best_residual_bits = 0;
1508         unsigned residual_sample;
1509         unsigned best_parameters_index = 0;
1510         const unsigned blocksize = residual_samples + predictor_order;
1511
1512         /* compute abs(residual) for use later */
1513         for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) {
1514                 r = residual[residual_sample];
1515                 abs_residual[residual_sample] = (FLAC__uint32)(r<0? -r : r);
1516         }
1517
1518         while(max_partition_order > 0 && blocksize >> max_partition_order <= predictor_order)
1519                 max_partition_order--;
1520         FLAC__ASSERT(blocksize >> max_partition_order > predictor_order);
1521         min_partition_order = min(min_partition_order, max_partition_order);
1522
1523         if(precompute_partition_sums) {
1524                 int partition_order;
1525                 unsigned sum;
1526
1527                 stream_encoder_precompute_partition_info_sums_(abs_residual, abs_residual_partition_sums, residual_samples, predictor_order, min_partition_order, max_partition_order);
1528
1529                 if(do_escape_coding)
1530                         stream_encoder_precompute_partition_info_escapes_(residual, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order);
1531
1532                 for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) {
1533 #ifdef DONT_ESTIMATE_RICE_BITS
1534                         if(!stream_encoder_set_partitioned_rice_with_precompute_(residual, abs_residual_partition_sums+sum, raw_bits_per_partition+sum, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, (unsigned)partition_order, do_escape_coding, private_->parameters[!best_parameters_index], private_->raw_bits[!best_parameters_index], &residual_bits))
1535 #else
1536                         if(!stream_encoder_set_partitioned_rice_with_precompute_(abs_residual, abs_residual_partition_sums+sum, raw_bits_per_partition+sum, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, (unsigned)partition_order, do_escape_coding, private_->parameters[!best_parameters_index], private_->raw_bits[!best_parameters_index], &residual_bits))
1537 #endif
1538                         {
1539                                 FLAC__ASSERT(best_residual_bits != 0);
1540                                 break;
1541                         }
1542                         sum += 1u << partition_order;
1543                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1544                                 best_residual_bits = residual_bits;
1545                                 *best_partition_order = partition_order;
1546                                 best_parameters_index = !best_parameters_index;
1547                         }
1548                 }
1549         }
1550         else {
1551                 unsigned partition_order;
1552                 for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) {
1553 #ifdef DONT_ESTIMATE_RICE_BITS
1554                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, private_->parameters[!best_parameters_index], &residual_bits))
1555 #else
1556                         if(!stream_encoder_set_partitioned_rice_(abs_residual, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, private_->parameters[!best_parameters_index], &residual_bits))
1557 #endif
1558                         {
1559                                 FLAC__ASSERT(best_residual_bits != 0);
1560                                 break;
1561                         }
1562                         if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1563                                 best_residual_bits = residual_bits;
1564                                 *best_partition_order = partition_order;
1565                                 best_parameters_index = !best_parameters_index;
1566                         }
1567                 }
1568         }
1569
1570         memcpy(best_parameters, private_->parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1571         memcpy(best_raw_bits, private_->raw_bits[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1572
1573         return best_residual_bits;
1574 }
1575
1576 void stream_encoder_precompute_partition_info_sums_(const FLAC__uint32 abs_residual[], FLAC__uint64 abs_residual_partition_sums[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order)
1577 {
1578         int partition_order;
1579         unsigned from_partition, to_partition = 0;
1580         const unsigned blocksize = residual_samples + predictor_order;
1581
1582         /* first do max_partition_order */
1583         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1584                 FLAC__uint64 abs_residual_partition_sum;
1585                 FLAC__uint32 abs_r;
1586                 unsigned partition, partition_sample, partition_samples, residual_sample;
1587                 const unsigned partitions = 1u << partition_order;
1588                 const unsigned default_partition_samples = blocksize >> partition_order;
1589
1590                 FLAC__ASSERT(default_partition_samples > predictor_order);
1591
1592                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1593                         partition_samples = default_partition_samples;
1594                         if(partition == 0)
1595                                 partition_samples -= predictor_order;
1596                         abs_residual_partition_sum = 0;
1597                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1598                                 abs_r = abs_residual[residual_sample];
1599                                 abs_residual_partition_sum += abs_r;
1600                                 residual_sample++;
1601                         }
1602                         abs_residual_partition_sums[partition] = abs_residual_partition_sum;
1603                 }
1604                 to_partition = partitions;
1605                 break;
1606         }
1607
1608         /* now merge partitions for lower orders */
1609         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1610                 FLAC__uint64 s;
1611                 unsigned i;
1612                 const unsigned partitions = 1u << partition_order;
1613                 for(i = 0; i < partitions; i++) {
1614                         s = abs_residual_partition_sums[from_partition];
1615                         from_partition++;
1616                         abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition];
1617                         from_partition++;
1618                         to_partition++;
1619                 }
1620         }
1621 }
1622
1623 void stream_encoder_precompute_partition_info_escapes_(const FLAC__int32 residual[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order)
1624 {
1625         int partition_order;
1626         unsigned from_partition, to_partition = 0;
1627         const unsigned blocksize = residual_samples + predictor_order;
1628
1629         /* first do max_partition_order */
1630         for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) {
1631                 FLAC__int32 r, residual_partition_min, residual_partition_max;
1632                 unsigned silog2_min, silog2_max;
1633                 unsigned partition, partition_sample, partition_samples, residual_sample;
1634                 const unsigned partitions = 1u << partition_order;
1635                 const unsigned default_partition_samples = blocksize >> partition_order;
1636
1637                 FLAC__ASSERT(default_partition_samples > predictor_order);
1638
1639                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1640                         partition_samples = default_partition_samples;
1641                         if(partition == 0)
1642                                 partition_samples -= predictor_order;
1643                         residual_partition_min = residual_partition_max = 0;
1644                         for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) {
1645                                 r = residual[residual_sample];
1646                                 if(r < residual_partition_min)
1647                                         residual_partition_min = r;
1648                                 else if(r > residual_partition_max)
1649                                         residual_partition_max = r;
1650                                 residual_sample++;
1651                         }
1652                         silog2_min = FLAC__bitmath_silog2(residual_partition_min);
1653                         silog2_max = FLAC__bitmath_silog2(residual_partition_max);
1654                         raw_bits_per_partition[partition] = max(silog2_min, silog2_max);
1655                 }
1656                 to_partition = partitions;
1657                 break;
1658         }
1659
1660         /* now merge partitions for lower orders */
1661         for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) {
1662                 unsigned m;
1663                 unsigned i;
1664                 const unsigned partitions = 1u << partition_order;
1665                 for(i = 0; i < partitions; i++) {
1666                         m = raw_bits_per_partition[from_partition];
1667                         from_partition++;
1668                         raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]);
1669                         from_partition++;
1670                         to_partition++;
1671                 }
1672         }
1673 }
1674
1675 #ifdef VARIABLE_RICE_BITS
1676 #undef VARIABLE_RICE_BITS
1677 #endif
1678 #ifndef DONT_ESTIMATE_RICE_BITS
1679 #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter))
1680 #endif
1681
1682 #ifdef DONT_ESTIMATE_RICE_BITS
1683 FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const FLAC__int32 residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits)
1684 #else
1685 FLAC__bool stream_encoder_set_partitioned_rice_(const FLAC__uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned *bits)
1686 #endif
1687 {
1688         unsigned rice_parameter, partition_bits;
1689 #ifndef NO_RICE_SEARCH
1690         unsigned best_partition_bits;
1691         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1692 #endif
1693         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1694
1695         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1696
1697         if(partition_order == 0) {
1698                 unsigned i;
1699
1700 #ifndef NO_RICE_SEARCH
1701                 if(rice_parameter_search_dist) {
1702                         if(suggested_rice_parameter < rice_parameter_search_dist)
1703                                 min_rice_parameter = 0;
1704                         else
1705                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1706                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1707                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1708 #ifdef DEBUG_VERBOSE
1709                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @2\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1710 #endif
1711                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1712                         }
1713                 }
1714                 else
1715                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1716
1717                 best_partition_bits = 0xffffffff;
1718                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1719 #endif
1720 #ifdef VARIABLE_RICE_BITS
1721 #ifdef FLAC__SYMMETRIC_RICE
1722                         partition_bits = (2+rice_parameter) * residual_samples;
1723 #else
1724                         const unsigned rice_parameter_estimate = rice_parameter-1;
1725                         partition_bits = (1+rice_parameter) * residual_samples;
1726 #endif
1727 #else
1728                         partition_bits = 0;
1729 #endif
1730                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1731                         for(i = 0; i < residual_samples; i++) {
1732 #ifdef VARIABLE_RICE_BITS
1733 #ifdef FLAC__SYMMETRIC_RICE
1734                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1735 #else
1736                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1737 #endif
1738 #else
1739                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1740 #endif
1741                         }
1742 #ifndef NO_RICE_SEARCH
1743                         if(partition_bits < best_partition_bits) {
1744                                 best_rice_parameter = rice_parameter;
1745                                 best_partition_bits = partition_bits;
1746                         }
1747                 }
1748 #endif
1749                 parameters[0] = best_rice_parameter;
1750                 bits_ += best_partition_bits;
1751         }
1752         else {
1753                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1754                 unsigned partition_samples;
1755                 FLAC__uint64 mean, k;
1756                 const unsigned partitions = 1u << partition_order;
1757                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1758                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1759                         if(partition == 0) {
1760                                 if(partition_samples <= predictor_order)
1761                                         return false;
1762                                 else
1763                                         partition_samples -= predictor_order;
1764                         }
1765                         mean = 0;
1766                         save_residual_sample = residual_sample;
1767                         for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++)
1768                                 mean += abs_residual[residual_sample];
1769                         residual_sample = save_residual_sample;
1770 #ifdef FLAC__SYMMETRIC_RICE
1771                         mean += partition_samples >> 1; /* for rounding effect */
1772                         mean /= partition_samples;
1773
1774                         /* calc rice_parameter = floor(log2(mean)) */
1775                         rice_parameter = 0;
1776                         mean>>=1;
1777                         while(mean) {
1778                                 rice_parameter++;
1779                                 mean >>= 1;
1780                         }
1781 #else
1782                         /* calc rice_parameter ala LOCO-I */
1783                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1784                                 ;
1785 #endif
1786                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1787 #ifdef DEBUG_VERBOSE
1788                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @3\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1789 #endif
1790                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1791                         }
1792
1793 #ifndef NO_RICE_SEARCH
1794                         if(rice_parameter_search_dist) {
1795                                 if(rice_parameter < rice_parameter_search_dist)
1796                                         min_rice_parameter = 0;
1797                                 else
1798                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1799                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1800                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1801 #ifdef DEBUG_VERBOSE
1802                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @4\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1803 #endif
1804                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1805                                 }
1806                         }
1807                         else
1808                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1809
1810                         best_partition_bits = 0xffffffff;
1811                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1812 #endif
1813 #ifdef VARIABLE_RICE_BITS
1814 #ifdef FLAC__SYMMETRIC_RICE
1815                                 partition_bits = (2+rice_parameter) * partition_samples;
1816 #else
1817                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1818                                 partition_bits = (1+rice_parameter) * partition_samples;
1819 #endif
1820 #else
1821                                 partition_bits = 0;
1822 #endif
1823                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1824                                 save_residual_sample = residual_sample;
1825                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
1826 #ifdef VARIABLE_RICE_BITS
1827 #ifdef FLAC__SYMMETRIC_RICE
1828                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
1829 #else
1830                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
1831 #endif
1832 #else
1833                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] in addition to abs_residual[] */
1834 #endif
1835                                 }
1836 #ifndef NO_RICE_SEARCH
1837                                 if(rice_parameter != max_rice_parameter)
1838                                         residual_sample = save_residual_sample;
1839                                 if(partition_bits < best_partition_bits) {
1840                                         best_rice_parameter = rice_parameter;
1841                                         best_partition_bits = partition_bits;
1842                                 }
1843                         }
1844 #endif
1845                         parameters[partition] = best_rice_parameter;
1846                         bits_ += best_partition_bits;
1847                 }
1848         }
1849
1850         *bits = bits_;
1851         return true;
1852 }
1853
1854 #ifdef DONT_ESTIMATE_RICE_BITS
1855 FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__int32 residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits)
1856 #else
1857 FLAC__bool stream_encoder_set_partitioned_rice_with_precompute_(const FLAC__uint32 abs_residual[], const FLAC__uint64 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, const FLAC__bool search_for_escapes, unsigned parameters[], unsigned raw_bits[], unsigned *bits)
1858 #endif
1859 {
1860         unsigned rice_parameter, partition_bits;
1861 #ifndef NO_RICE_SEARCH
1862         unsigned best_partition_bits;
1863         unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0;
1864 #endif
1865         unsigned flat_bits;
1866         unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1867
1868         FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER);
1869
1870         if(partition_order == 0) {
1871                 unsigned i;
1872
1873 #ifndef NO_RICE_SEARCH
1874                 if(rice_parameter_search_dist) {
1875                         if(suggested_rice_parameter < rice_parameter_search_dist)
1876                                 min_rice_parameter = 0;
1877                         else
1878                                 min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist;
1879                         max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist;
1880                         if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1881 #ifdef DEBUG_VERBOSE
1882                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @5\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1883 #endif
1884                                 max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1885                         }
1886                 }
1887                 else
1888                         min_rice_parameter = max_rice_parameter = suggested_rice_parameter;
1889
1890                 best_partition_bits = 0xffffffff;
1891                 for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1892 #endif
1893 #ifdef VARIABLE_RICE_BITS
1894 #ifdef FLAC__SYMMETRIC_RICE
1895                         partition_bits = (2+rice_parameter) * residual_samples;
1896 #else
1897                         const unsigned rice_parameter_estimate = rice_parameter-1;
1898                         partition_bits = (1+rice_parameter) * residual_samples;
1899 #endif
1900 #else
1901                         partition_bits = 0;
1902 #endif
1903                         partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1904                         for(i = 0; i < residual_samples; i++) {
1905 #ifdef VARIABLE_RICE_BITS
1906 #ifdef FLAC__SYMMETRIC_RICE
1907                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter);
1908 #else
1909                                 partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1910 #endif
1911 #else
1912                                 partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
1913 #endif
1914                         }
1915 #ifndef NO_RICE_SEARCH
1916                         if(partition_bits < best_partition_bits) {
1917                                 best_rice_parameter = rice_parameter;
1918                                 best_partition_bits = partition_bits;
1919                         }
1920                 }
1921 #endif
1922                 if(search_for_escapes) {
1923                         flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[0] * residual_samples;
1924                         if(flat_bits <= best_partition_bits) {
1925                                 raw_bits[0] = raw_bits_per_partition[0];
1926                                 best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
1927                                 best_partition_bits = flat_bits;
1928                         }
1929                 }
1930                 parameters[0] = best_rice_parameter;
1931                 bits_ += best_partition_bits;
1932         }
1933         else {
1934                 unsigned partition, residual_sample, save_residual_sample, partition_sample;
1935                 unsigned partition_samples;
1936                 FLAC__uint64 mean, k;
1937                 const unsigned partitions = 1u << partition_order;
1938                 for(partition = residual_sample = 0; partition < partitions; partition++) {
1939                         partition_samples = (residual_samples+predictor_order) >> partition_order;
1940                         if(partition == 0) {
1941                                 if(partition_samples <= predictor_order)
1942                                         return false;
1943                                 else
1944                                         partition_samples -= predictor_order;
1945                         }
1946                         mean = abs_residual_partition_sums[partition];
1947 #ifdef FLAC__SYMMETRIC_RICE
1948                         mean += partition_samples >> 1; /* for rounding effect */
1949                         mean /= partition_samples;
1950
1951                         /* calc rice_parameter = floor(log2(mean)) */
1952                         rice_parameter = 0;
1953                         mean>>=1;
1954                         while(mean) {
1955                                 rice_parameter++;
1956                                 mean >>= 1;
1957                         }
1958 #else
1959                         /* calc rice_parameter ala LOCO-I */
1960                         for(rice_parameter = 0, k = partition_samples; k < mean; rice_parameter++, k <<= 1)
1961                                 ;
1962 #endif
1963                         if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1964 #ifdef DEBUG_VERBOSE
1965                                 fprintf(stderr, "clipping rice_parameter (%u -> %u) @6\n", rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1966 #endif
1967                                 rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1968                         }
1969
1970 #ifndef NO_RICE_SEARCH
1971                         if(rice_parameter_search_dist) {
1972                                 if(rice_parameter < rice_parameter_search_dist)
1973                                         min_rice_parameter = 0;
1974                                 else
1975                                         min_rice_parameter = rice_parameter - rice_parameter_search_dist;
1976                                 max_rice_parameter = rice_parameter + rice_parameter_search_dist;
1977                                 if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
1978 #ifdef DEBUG_VERBOSE
1979                                         fprintf(stderr, "clipping rice_parameter (%u -> %u) @7\n", max_rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1);
1980 #endif
1981                                         max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1;
1982                                 }
1983                         }
1984                         else
1985                                 min_rice_parameter = max_rice_parameter = rice_parameter;
1986
1987                         best_partition_bits = 0xffffffff;
1988                         for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) {
1989 #endif
1990 #ifdef VARIABLE_RICE_BITS
1991 #ifdef FLAC__SYMMETRIC_RICE
1992                                 partition_bits = (2+rice_parameter) * partition_samples;
1993 #else
1994                                 const unsigned rice_parameter_estimate = rice_parameter-1;
1995                                 partition_bits = (1+rice_parameter) * partition_samples;
1996 #endif
1997 #else
1998                                 partition_bits = 0;
1999 #endif
2000                                 partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2001                                 save_residual_sample = residual_sample;
2002                                 for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) {
2003 #ifdef VARIABLE_RICE_BITS
2004 #ifdef FLAC__SYMMETRIC_RICE
2005                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter);
2006 #else
2007                                         partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate);
2008 #endif
2009 #else
2010                                         partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */
2011 #endif
2012                                 }
2013 #ifndef NO_RICE_SEARCH
2014                                 if(rice_parameter != max_rice_parameter)
2015                                         residual_sample = save_residual_sample;
2016                                 if(partition_bits < best_partition_bits) {
2017                                         best_rice_parameter = rice_parameter;
2018                                         best_partition_bits = partition_bits;
2019                                 }
2020                         }
2021 #endif
2022                         if(search_for_escapes) {
2023                                 flat_bits = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN + raw_bits_per_partition[partition] * partition_samples;
2024                                 if(flat_bits <= best_partition_bits) {
2025                                         raw_bits[partition] = raw_bits_per_partition[partition];
2026                                         best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2027                                         best_partition_bits = flat_bits;
2028                                 }
2029                         }
2030                         parameters[partition] = best_rice_parameter;
2031                         bits_ += best_partition_bits;
2032                 }
2033         }
2034
2035         *bits = bits_;
2036         return true;
2037 }
2038
2039 unsigned stream_encoder_get_wasted_bits_(FLAC__int32 signal[], unsigned samples)
2040 {
2041         unsigned i, shift;
2042         FLAC__int32 x = 0;
2043
2044         for(i = 0; i < samples && !(x&1); i++)
2045                 x |= signal[i];
2046
2047         if(x == 0) {
2048                 shift = 0;
2049         }
2050         else {
2051                 for(shift = 0; !(x&1); shift++)
2052                         x >>= 1;
2053         }
2054
2055         if(shift > 0) {
2056                 for(i = 0; i < samples; i++)
2057                          signal[i] >>= shift;
2058         }
2059
2060         return shift;
2061 }